2896 client - Style empty input/output messages in execution tabs panel

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ivicac

client/src/shared/components/workflow-executions/WorkflowExecutionsTabsPanel.tsx

@@ -184,7 +184,9 @@ const WorkflowExecutionsTabsPanel = ({
                         {selectedItem?.input ? (
                             <WorkflowExecutionContent input={selectedItem?.input} />
                         ) : (
-                            <span className="p-1 text-sm">No input data.</span>
+                            <div className="flex items-center justify-center p-4">
+                                <span className="text-sm text-muted-foreground">No input data</span>
+                            </div>
                         )}
                     </TabsContent>
 
@@ -198,7 +200,9 @@ const WorkflowExecutionsTabsPanel = ({
                                 }
                             />
                         ) : (
-                            <span className="p-1 text-sm">No output data.</span>
+                            <div className="flex items-center justify-center p-4">
+                                <span className="text-sm text-muted-foreground">No output data</span>
+                            </div>
                         )}
                     </TabsContent>